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be shitting a brick
rude slang To be very scared or nervous. Of course I was shitting a brick when I woke up to the sounds of an intruder in my house!
be shitting a brick
or be shitting bricks
INFORMAL, VERY RUDEIf someone is shitting a brick or is shitting bricks, they are extremely frightened or worried about something. He knew he would be fired if he was late, so he was shitting a brick. He stands there looking at Billy with a face like thunder. And Billy is shitting bricks.